MED-867: Returns every completed live-session-delivery (MED02) session for the logged-in coach whose Medley Feedback Form is not yet submitted (feedback_submitted = false). Drives the multi-item "Submit Session Feedback" Needs Attention card — a deliberate sibling of the Overdue Attendance card.

Scope: only sessions that actually have a post-session Medley Feedback Form are returned — group sessions in a cohort whose group_coaching modality has ai_features_enabled = true. Pre-MED02 / non-facilitation sessions are structurally excluded. Drafts count as outstanding (the card retires only on Submit). A card also retires when its cohort becomes past/over (status completed/archived, matching the Active Cohorts non-past definition).

Gated by the live_session_delivery feature flag (MED-886): when the flag is off this route returns 404 and the query is never run.